TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
2. Water-Reducing Admixture: ASTM C 494/C 494M, Type A.
3. Retarding Admixture: ASTM C 494/C 494M, Type B.
4. Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type D.
5. Water-Reducing and Accelerating Admixture: ASTM C 494/C 494M, Type E.
6. High-Range, Water-Reducing Admixture: ASTM C 494/C 494M, Type F.
7. High-Range, Water-Reducing and Retarding Admixture: ASTM C 494/C 494M, Type G.
8. Plasticizing and Retarding Admixture: ASTM C 1017/C 1017M, Type II.
2.6 PILE ACCESSORIES
A. Pile Shoes: 1-inch- (25-mm-) thick, minimum, carbon-steel plate fabricated to match shape of pile tip.
B. Pile Splices: Manufactured from carbon-steel plates or castings and capable of developing strength of
continuous pile at splice location.
2.7 CONCRETE MIXES
A. Prepare design mixes for each type of concrete required.
1. Limit use of fly ash and silica fume to not exceed, in total, 25 percent of portland cement by weight.
B. Design mixes may be prepared by a qualified independent testing agency or by qualified personnel at
precast manufacturing plant at precast manufacturer's option.
C. Proportion mixes by either laboratory trial batch or field test data methods according to ACI 211.1, with
materials to be used on Project, to provide normal-weight concrete with the following properties:
1. Compressive Strength (28 Days): 6000 psi (41.4 MPa.
2. Maximum Water-Cementitious Material Ratio: 0.40.
D. Add air-entraining admixture at manufacturer's prescribed rate to result in normal-weight concrete at point
of placement having an air content of 2.5 to 4.5 percent.
2.8 FABRICATION
A. Molds: Accurately construct molds, mortar tight, of sufficient strength to withstand pressures due to
concrete placement, temperature changes, and for pretensioning and detensioning operations. Maintain
molds to provide completed piles of shapes, lines, and dimensions indicated, within fabrication tolerances
specified in PCI MNL-116 and PCI MNL-135.
1. Unless molds are stripped before detensioning, design molds so stresses are not induced in piles
due to deformation of concrete under prestress or movement during detensioning.
2. Chamfer edges and corners of square piles.
B. Reinforcement: Comply with recommendations in CRSI's "Manual of Standard Practice" for fabricating,
placing, and supporting reinforcement. Clean reinforcement of loose rust and mill scale, earth, and other
materials that reduce or destroy bond with concrete.
PRESTRESSED CONCRETE PILES 02457 - 5